A dated molecular perspective of eucalypt taxonomy, evolution and diversification
Andrew H. Thornhill
A B C H , Michael D. Crisp D , Carsten Külheim D E , Kristy E. Lam A , Leigh A. Nelson F , David K. Yeates F and Joseph T. Miller A G
+ Author Affiliations
- Author Affiliations
A Centre for Australian National Biodiversity Research, National Research Collections, Black Mountain, CSIRO, Canberra, ACT 2601, Australia.
B Australian Tropical Herbarium, James Cook University, Cairns, Qld 4870, Australia.
C University and Jepson Herbaria, and Department of Integrative Biology, University of California, Berkeley, CA 94720-2465, USA.
D Division of Ecology and Evolution, Research School of Biology, Australian National University, Canberra, ACT 2601, Australia.
E School of Forest Resources and Environmental Science, Michigan Technological University, Houghton, MI 49931, USA.
F Australian National Insect Collection and Taxonomic Research and Information Network, National Research Collections, Black Mountain, CSIRO, ACT 2601, Australia.
G Office of International Science and Engineering, National Science Foundation, Alexandria, VA 22314, USA.
H Corresponding author. Email: andrew.thornhill@gmail.com
Australian Systematic Botany 32(1) 29-48 https://doi.org/10.1071/SB18015
Submitted: 25 March 2018 Accepted: 14 February 2019 Published: 9 April 2019
Abstract
The eucalypts, which include Eucalyptus, Angophora and Corymbia, are native to Australia and Malesia and include over 800 named species in a mixture of diverse and depauperate lineages. We assessed the fit of the eucalypt taxonomic classification to a phylogeny of 711 species scored for DNA sequences of plastid matK and psbA–trnH, as well as nuclear internal transcribed spacer and external transcribed spacer. Two broadly similar topologies emerge from both maximum likelihood and Bayesian analyses, showing Angophora nested within Corymbia, or Angophora sister to Corymbia. The position of certain species-poor groups on long branches fluctuated relative to the three major Eucalyptus subgenera, and positions of several closely related species within those subgenera were unstable and lacked statistical support. Most sections and series of Eucalyptus were not recovered as monophyletic. We calibrated these phylogenies against time, using penalised likelihood and constraints obtained from fossil ages. On the basis of these trees, most major eucalypt subgenera arose in the Late Eocene and Early Oligocene. All Eucalyptus clades with taxa occurring in south-eastern Australia have crown ages <20 million years. Several eucalypt clades display a strong present-day geographic disjunction, although these clades did not have strong phylogenetic statistical support. In particular, the estimated age of the separation between the eudesmids (Eucalyptus subgenus Eudesmia) and monocalypts (Eucalyptus subgenus Eucalyptus) was consistent with extensive inland water bodies in the Eocene. Bayesian analysis of macroevolutionary mixture rates of net species diversification accelerated in five sections of Eucalyptus subgenus Symphyomyrtus, all beginning 2–3 million years ago and associated with semi-arid habitats dominated by mallee and mallet growth forms, and with open woodlands and forests in eastern Australia. This is the first time that a calibrated molecular study has shown support for the rapid diversification of eucalypts in the recent past, most likely driven by changing climate and diverse soil geochemical conditions.
Additional keywords: Bayesian analysis of macroevolutionary mixtures (BAMM), eucalypts, molecular dating, Myrtaceae, phylogenetics.
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